Hydraulic winding machine



Sept. 12, 1944. F. T. HARRINGTON ET AL.

- HYDRAULIC WINDING, MACHINE Fiied Jan. 20, 1940 M m mm m BMW 0 v z n mr A .mm ma 7 Patented Sept. 12, 1944 UNITED STATES PATENT OFFICE HYDRAULIC WINDING MACHINE Ferris T. Harrington and James Robinson, De-

troit, Mich., assignors to Vickers. Incorporated, Detroit, Mich, a corporation of Michigan Application January 20, 1940, Serial No. 314,755,

Claims. (Cl. 24,2 .75)

This invention relates to a hydraulic circuit for furnishing power and control to a winding drum.

The invention has particularly to do with the winding of continuous material such as paper or thread. In'such winding operations, which takes place during the manufacture, it is very often essential that a constant tension be maintained on the material as it is being wound. It is also important that the tension be limited in such a way that the continuous material will not break and thus cause an interruption in the manufacturing or other process. Another problem arises due to the fact that as a winding drum is filled with the material, the torque required to rotate the driu'n increases and some compensation must be made in the speed of the drum to maintain a constant tension.

. having to do with details of construction and operation of the various elements of the circuit, will be further'brought out in the following description and claims. I In the drawing:

Fig.1 consists of a circuit with certain elethe winding drum consists generally of a constant delivery pump l2 driven by motor 6, a fourway valve [3, a speed control device l4 and a flow control feed valve [5.

The variable delivery pump 1 is of awel -known variable piston displacement type in which the cylinder block 8 is movable from a stop-minimum volume position shown by the dotted lines in Fig. 1 to a maximum volume position shown by the full lines in Fig. 1. The speed control device l4 consists of a cylinder l 6 having a piston I! slidable therein. A piston rod l8 and a link l9- able torque motor 9, is of the well-known variable piston d splacement type. The movable torque control member 10 may be shifted from a stopminimum torque position shown in the dotted lines in Fig. 1, to any of a number of speed positions. one of them being illustrated by the full lines of Fig. l.

The torque control motor ll consists ,of a cylinder 25 which has a piston 26 slidable therein. A piston rod 21 projects from both ends of the piston 26 through both ends of the cylinder 25 ments of the circuit shown diagrammatically andother elements shown in cross section. Fig. 2 is a side view of a winding drum.

and a link 28 connects one end of the pistonrod with the movable-block 10.- The top end of the cylinder 25 is connected by a conduit 29 to the inlet conduit 2| of the motor. The lower end of the cylinder 25- is connected to the tank conduit Fig. 3 is a schematic section of the flow control valves.

Referring to Fig. 1, theelements of the circuit which are directly concerned with power transmission to a winding drum 5 are: an electric motor 6 a, variable deliverypump I driven. by the motor 6 and having a volume 'control cylinder block 8, a variable torque hydraulic motor 3 connected to the drum 5 and having a movable torque control member l0, and a torque control motor indicated generally at l I. The general type of pump 1 and motor 9 is shown in Patent No. 2,177,097 of October 24, 1939, to and Patent No. 2,200,811 of May 14, 1940, to Thompson.

The circuit whichhas specifically to do with the starting and control of the acceleration of valve3l 'andthe cylinder 25.

24 by a conduit 30 which leads through an adjustable check valve 3|. This check valve has a screw 32 for adjusting a spring 33. The conduits 29 and 30 are connected through a restriction 34*which enters the conduit 30 between the check I A spring 35 is positioned in the lower end of the cylinder 25 to urge the piston 26 upwardly. The function of this spring will be brought out later.

Referring now to the starting and acceleration control circuit, the outlet of the constant delivery pump 12 is connected to the four-way valve tank connections 40 and 4| which lead to the tank conduit 24. Between the four-way valve and the top of the cylinder I6 is a conduit. The lower end of. the cylinder I6 is connected tothe trol valve I5. This valve I is adapted to provide for a constant flow of liquid from the lower end of the cylinder I6 to a tank connection of the four-way valve I3. The flow control valve is shown in Fig. 3 as having a housing I5 which is provided with a chamber I53 in communication with the incoming liquid and a chamber I54 for connecting a balanced inlet valve I55 and a variable orifice outlet valve I56. This outlet valve I56 controls the volume of liquid passing intothe outlet I51.

The balanced .valve I55 is connected by means of a stem I58 to a piston I59, the diameter of the stem at point I60 being predetermined relative to the effective diameter of the valve I55 at its valve seat. A coil spring I6I of predetermined pressure is so positioned as to tend to open valve I55. The chamber I54 is in direct communication with a chamber I62 on one side of the piston I59 by means of a passageway I63 so that the strength of the spring I6I as balanced against the pressure upon the area of the piston I 59 determines the opening of valve I55. A passage I 65 compensates for any back pressure. There is therefore a constant differential pressure across the orifice I55 regardless of back pressure.

A complete description of the operation of the valve I5 may be found in Vickers Patent No. 2,272,684, issued February 10, 1942. The four-way valve I3 has a valve spool 41 slidable therein connected by suitable links to an operating lever 48. This lever is movable from a full line start position as shown, to stop position, indicated by dotted lines. i v The continuous material being wound on the 'winding drum 5 is indicated at 50 in Figs. 1 and 2. This material passes over a guide 5| and the dotted line 52 shows the diameter of the drum after a, quantity of the material has been wound thereon.

In the operation: Assuming that the electric motor I5 is operating, pressure will be available from pumps land. I2. When the circuit is at rest, the block 8 of pump 1 will be in the dotted line position shown in Fig. 1. The lever 48 may then be moved to start position as shown. hi this position, low pressure liquidfrom pump I2 will pass'from the conduit 38 through four-way valve I3 to conduit 42 and the piston I! will be moved downwardly. However, the rate at which this piston may move downwardly is positively controlled by the rate at which liquid in the. lower portion of the cylinder I6 may pass through the flow control valve I5. This liquid 'will pass from the conduit 43 through the flow control ,valve at a definite rate depending on the adjustment ofthe valve and then through the four-way valve to the tank connection 40. As the piston II moves downwardly the cylinder block 8 will be moved, so that liquid under pressure, will gradually be directed in increasing volume to the motor 9. This will start the winding drum 5 since the shaft of the motor 9 is suitably connected to the winding drum. As the motor 9 accelerates, the piston U will gradually reach its lowermost position, as shown in the full lines in Fig. 1. This position willjbe maintained by pressure from the pump I2 and the discharge of pump" will then be bypassed to the tank from the pressure relief valve 39. By adjusting the stop screw 20, the average speed desired for the motor 9 may be predetermined.

Due to the small drum diameter at the be ginning of a winding operation, the torque required to rotate the drum will be relatively low and the R. P. M. of the drum will be high. As the drum is filled with material, the torque required increases and the R. P. M. of the drum should decrease in order to maintain a constant tension on the material. As soon as the variable delivery pump 7 begins to direct fluid under pressure to the motor 9, fluid will also be supplied to the top of the piston 26 through conduit 29. The lower end of the cylinder 25 will receive fluid from conduit 29 through the restriction 34. Since the upper and lower working areas of the piston 26 are equal, the piston will be pressure balanced. The spring is of suflicient strength to cause the piston 26 to offset the torque control member II] to the high speed minimum torque position as shown by the dotted lines in Fig. 1. As the diameter of the paper on the drum increases, the torque requirements to keep the drum turning also increase. This places an increasing load on motor 9 and increases the pressure in conduit 2|. When the pressure of the liquid in the conduit 2I and below the piston 26 exceeds the setting of relief valve 3|, fluid will be exhausted irom below the piston at a faster rate than it can be supplied through the restriction drum 5 with the pressure at the setting of the relief valve 3|. During the operation, the relief valve 22 protects the main circuit from excessive pressures.

If, in the course of the winding, any additional resistance occurs to the movement of the continuous material 50, the increase in torque exerted on the drum 5 will be transmitted to the motor 9 and speed will be proportionately reduced so that at all times a constant tension is exerted on the material being wound. When the winding drum has been filled to the proper diameter, the motor 9 may be stopped by shifting the control lever 48 to its stop position shown in dotted lines in Fig. 1. This will shift the piston 41 upward in the four-way valve I3 and connect the lower end of the cylinder IE to the pressure line 38. The fluid under pressure will pass to the cylinder through conduits 43 and 44 and the check valve 46. There will be a resulting movement'upward of the piston II, the liquid above the piston being directed to the tank through conduits 42 and tank connection I M. This movement upward of the piston II will shift the cylinder block 8 to its stop-mini mum volume position, as shown in the dotted lines of Fig. 1. Consequently, liquid under pressure will no longer be directed to the inlet of the motor 9. It-"will be seen thatif it were desired to bring about agradualstopping of the drum 5 as well as the gradual starting, a flow control valve I5 would be inserted in the con-. duit 42 in the same manner as shown with conduit43. i

We claim:

adaptedfor winding continuous material, of the typehaving a variable delivery pump as a source .of pressure, a winding drum, and a fluid actuated motor connectedto said winding drum and arranged to receive fluid under pressure from said variable delivery pump, a control device for said pump comprising a movable means on said pump shiftable from a minimum volume position to, a maximum volume position for varying the volume of fluid delivered to said motor, an auxiliary pump, power means for driving said pumps, hydraulically actuated means connected to said movable means, means for direoting fluid from said auxiliary pump to said i hydraulically actuated means whereby said movable'means may be shifted to any oi its various positions, and means efiective onsaid hydraulically actuated means for limiting the rate ofv movement of said movable means from the minimum volume position to any higher volume position whereby said winding drum will be accelerated gradually to avoid breakage of the material being wound.

, 2. In a device for reeling strip material of the type including a' reel, driving means for the reel including a variable delivery fluidpump and a fluid motor driven by the pump, fluid conduits forming supply and return conduits between the pump and motor, and control means for maintaining a constant peripheral tension on the moton and means connecting the other side 0 said control motor with a flow control device for limiting the flow of liquid and the rate of movement of said control motor.

4. In a device for reeling strip material of the type including a reel, driving means for the reel including a variable delivery fluid pump and a fluid motor driven by the pump, fluid conduits iorming supply and return conduits between the pump and motor, and control means for maintaining a constant peripheral tension on the material being reeled including means responsive to the fluid pressure developed by the motor in the supply connection for varying the displacement of the motor, said conduits being arranged to deliver to the motor the full discharge of the pump during normal operation, a means for limiting the initial tension in the material material being reeled including means responsive to the fluid pressure developed by the motor in the supply connection for varying the dis- ,the initial tension in the material being reeled comprising a pressure responsive auxiliary motor for varying the displacement of the pump, a source of pressure for operating said auxiliary motor, and means limiting the exhaust flow from said auxiliary motor for controlling the rate at which displacement of said' pump may be changed.

' charge of the pump during normal operation, a

means for limiting the'initial tension in the material being reeled comprising a-controLdevlce for the output of said pump including a movable placement of the motor, a means for limiting being reeled comprising a control device for the output of said pump including a movable means on said pump shiftable from a minimum to a maximum volume position for varying the volume of fluid delivered to said motor, an auxiliary pump, power means for driving said pumps, hydraulically actuated means connected to said movable means, means for directing fluid from said auxiliary pump to said hydraulically actuated means whereby said movable means may be shifted to any of its various positions, and means efiective on said hydraulically actuated means for limiting the rate of movement of said movable means from the minimum volume position to'any higher volume position whereby said winding reel will be accelerated gradually to avoid'breakage of the material being wound.

5.. In a device for reelingstrip material of the type including a reel, driving means for the reel including a variable delivery fluid pump and a fluid motor driven by the pump, fluid conduits forming supply: return conduits between the pump and motor, and control means for maintaining aconst'ant peripheral tension on the material being reeled including means responsive i r 3. In a device for reeling strip material of the to the fluid pressure developed by the motor in thesupply connection for varying the displacement of the-motor, said conduits being arrangedto deliver to the motor the full discharge of the pump during normal operation, a means for limiting the initial tension in the material being reeled comprising a volumecontrolling mem- -'ber on said delivery pump, means for limiting the acceleration of said motor to avoid breakage or said material being wound comprising an auxiliary source of pressure, hydraulically actuated means operably connected with said volume control member, means for directing said auxiliary.

means on said pump shiitable from a minimum I to a maximumvclume position, an auxiliarysource of pressure, a piston-cylinder control {motor for controlling the position or said movable means-means connecting said auxiliary source of'pressure withone side otsaid control pressure to said hydraulically actuated means to shift the same to increase or decrease the volume outputof said variable delivery pump, and means .for limiting the rate of movement of said volume control member'from a minimum posi- --tion to any higher volume position to limit the acceleration of the variable delivery motor.

- r'nnms 'r. HARRINGTON. JAMES ROBINSON. 

